/*
 * Copyright (c) 2015-2020, www.dibo.ltd (service@dibo.ltd).
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * <p>
 * https://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.icesoft.framework.core.util;

import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.icesoft.framework.core.exception.InvalidUsageException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

/***
 * JSON操作辅助类
 */
@SuppressWarnings({"unchecked", "JavaDoc", "UnnecessaryLocalVariable"})
public class JSON {
	private static final Logger log = LoggerFactory.getLogger(JSON.class);

	private static ObjectMapper objectMapper;

	/**
	 * 初始化ObjectMapper
	 *
	 * @return
	 */
	private static ObjectMapper getObjectMapper() {
		if (objectMapper != null) {
			return objectMapper;
		}
		objectMapper = ContextHelper.getBean(ObjectMapper.class);
		if (objectMapper == null) {
			throw new InvalidUsageException("未找到 ObjectMapper实例，请检查配置类！");
		}
		return objectMapper;
	}

	/**
	 * 将Java对象转换为Json String
	 *
	 * @param object
	 * @return
	 */
	public static String stringify(Object object) {
		return toJSONString(object);
	}

	/**
	 * 转换对象为JSON字符串
	 *
	 * @param model
	 * @return
	 */
	public static String toJSONString(Object model) {
		try {
			String json = getObjectMapper().writeValueAsString(model);
			return json;
		} catch (Exception e) {
			log.error("Java转Json异常", e);
			return null;
		}
	}

	/***
	 * 将JSON字符串转换为java对象
	 * @param jsonStr
	 * @param clazz
	 * @return
	 */
	public static <T> T toJavaObject(String jsonStr, Class<T> clazz) {
		try {
			T model = getObjectMapper().readValue(jsonStr, clazz);
			return model;
		} catch (Exception e) {
			log.error("Json转Java异常", e);
			return null;
		}
	}

	/***
	 * 将JSON字符串转换为Map<String, Object></>对象
	 * @param jsonStr
	 * @return
	 */
	public static Map<String, Object> parseObject(String jsonStr) {
		try {
			JavaType javaType = getObjectMapper().getTypeFactory().constructParametricType(Map.class, String.class, Object.class);
			return getObjectMapper().readValue(jsonStr, javaType);
		} catch (Exception e) {
			log.error("Json转Java异常", e);
			return null;
		}
	}

	/***
	 * 将JSON字符串转换为java对象
	 * @param jsonStr
	 * @param clazz
	 * @return
	 */
	public static <T> T parseObject(String jsonStr, Class<T> clazz) {
		return toJavaObject(jsonStr, clazz);
	}

	/***
	 * 将JSON字符串转换为复杂类型的Java对象
	 * @param jsonStr
	 * @param typeReference
	 * @return
	 */
	public static <T> T parseObject(String jsonStr, TypeReference<T> typeReference) {
		try {
			T model = getObjectMapper().readValue(jsonStr, typeReference);
			return model;
		} catch (Exception e) {
			log.error("Json转Java异常", e);
			return null;
		}
	}


	/***
	 * 将JSON字符串转换为list对象
	 * @param jsonStr
	 * @return
	 */
	public static <T> List<T> parseArray(String jsonStr, Class<T> clazz) {
		try {
			JavaType javaType = getObjectMapper().getTypeFactory().constructParametricType(List.class, clazz);
			return getObjectMapper().readValue(jsonStr, javaType);
		} catch (Exception e) {
			log.error("Json转Java异常", e);
			return null;
		}
	}

	/***
	 * 将JSON字符串转换为java对象
	 * @param jsonStr
	 * @return
	 */

	public static <K, T> Map<K, T> toMap(String jsonStr) {
		return (Map<K, T>) toJavaObject(jsonStr, Map.class);
	}

	/***
	 * 将JSON字符串转换为Map对象
	 * @param jsonStr
	 * @return
	 */
	public static <K, T> LinkedHashMap<K, T> toLinkedHashMap(String jsonStr) {
		if (V.isEmpty(jsonStr)) {
			return null;
		}
		return (LinkedHashMap<K, T>) toJavaObject(jsonStr, LinkedHashMap.class);
	}
}